`IUDPTransport.getHost` is documented as returning `IPv4Address` instances. This should probably change.

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Once this is resolved, Twisted servers should be able to bind UDP ports on IPv6 addresses, eg `::1` or `fe80::1%lo0` or `::`, as well as send datagrams to IPv6 address from such ports. Note that where the platform requires the scope id, `IReactorUDP.listenUDP` and `IUDPTransport.write` will require the scope id as well.

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Once this is resolved, Twisted servers should be able to bind UDP ports on IPv6 addresses, eg `::1` or `::`, as well as send datagrams to IPv6 address from such ports.